The application of laser-induced multi-scale surface texturing

Engleman, P. G.; Dahotre, Narendra B.; Kurella, Anil; Samant, Anoop N.; Blue, Craig A.

doi:10.1007/s11837-005-0182-2

Cited by 18 publications

(20 citation statements)

References 22 publications

(28 reference statements)

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“…This allows the creation of periodic surface textures at length scales ranging from micro to nano in a single-step process. A detailed schematic set-up of the process is illustrated in figure 1 (Engleman et al 2005). The area irradiated by the laser beam was approximately 0.5024 cm 2 .…”

Section: Laser Microtexturing (A) Interference Patterningmentioning

confidence: 99%

“…The two interfering laser beams create a sinusoidal intensity distribution with high-and low-intensity lines. The distance w between the high-intensity spots (periodicity) can be varied with the angle (b) between the beams as per the following Bragg's equation (Daniel et al 2003(Daniel et al , 2005Engleman et al 2005;Lasagni et al 2006Lasagni et al , 2007: (Dabhade et al 2007) viscocity of precursor (Ca-P tribasic) 6.8 mPas ) surface tension precursor (Ca-P tribasic) 28 mN m −1 ) latent heat of melting of precursor (Ca-P tribasic) 49.9 kJ mol −1 (Dyshlovenko et al 2004) latent heat of melting of substrate 290 kJ mol −1 (Boivineau et al 2006) In the present work, the patterns were obtained by varying the laser power. The pillar-like patterns were synthesized in a two-step process, in which the sample periodicity w was kept constant at 2.5 mm.…”

Section: Laser Microtexturing (A) Interference Patterningmentioning

confidence: 99%

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Wetting behaviour of laser synthetic surface microtextures on Ti–6Al–4V for bioapplication

Dahotre

Paital

Samant

et al. 2010

Phil. Trans. R. Soc. A.

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Wettability at the surface of an implant material plays a key role in its success as it modulates the protein adsorption and thereby influences cell attachment and tissue integration at the interface. Hence, surface engineering of implantable materials to enhance wettability to physiological fluid under in vivo conditions is an area of active research. In light of this, in the present work, laser-based optical interference and direct melting techniques were used to develop synthetic microtextures on Ti-6Al-4V alloys, and their effects on wettability were studied systematically. Improved wettability to simulated body fluid and distilled water was observed for Ca-P coatings obtained by direct melting technique. This superior wettability was attributed to both the appropriate surface chemistry and the three-dimensional surface features obtained using this technique. To assert a better control on surface texture and wettability, a threedimensional thermal model based on COMSOL's multiphysics was employed to predict the features obtained by laser melting technique. The effect of physical texture and wetting on biocompatibility of laser-processed Ca-P coatings was evaluated in the preliminary efforts on culturing of mouse MC3T3-E1 osteoblast cells.

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Section: Laser Microtexturing (A) Interference Patterningmentioning

confidence: 99%

Section: Laser Microtexturing (A) Interference Patterningmentioning

confidence: 99%

Wetting behaviour of laser synthetic surface microtextures on Ti–6Al–4V for bioapplication

Dahotre

Paital

Samant

et al. 2010

Phil. Trans. R. Soc. A.

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“…Recent efforts by Engelman et al have sought to incorporate laser-based interference patterning with laser melting in order to obtain textured surfaces and other microscale features. 53 …”

Section: Laser Processing Of Biomaterialsmentioning

confidence: 99%

Laser micro- and nanofabrication of biomaterials

Narayan

Goering

2011

MRS Bull.

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Over the past half century, rapid progress has been made in laser-based medical diagnosis and treatment as well as in laser-based medical device fabrication. Lasers have unique capabilities for coating, machining, melting, polymerizing, sintering, and welding materials that are used in implantable and transdermal medical devices. In this review, academic and industrial developments involving laser processing of materials for dental, orthopedic, neural, ophthalmic, cardiovascular, and transdermal applications are described. In addition, laser processing of nanoscale materials for medical applications is discussed. Finally, challenges associated with commercialization of laser biomaterials are considered. Due to the unique capabilities provided by laser-based processes, it is anticipated that the use of laser biomaterials in implantable and transdermal medical devices will markedly increase over the coming years.Roger Narayan, UNC/NCSU Joint Department of Biomedical Engineering , Raleigh , NC , USA ; roger_narayan@msn.com Peter Goering, Center for Devices and Radiological Health , U.S. Food and Drug Administration , Silver Spring , MD , USA ; peter.goering@fda.hhs. Edwards et al. described medical applications of free-electron lasers, which use light emitted by accelerated electrons. Infrared light emission from these lasers may be used for human neurosurgery, including treatment of metastatic brain tumors and ophthalmic surgery. 15 -19 They noted that use of a free-electron laser with 6.45 μ m emission for tissue ablation was correlated with minimal or undetectable collateral tissue damage. This wavelength is associated with brittle fracture at the commencement of explosive vaporization, mitigating damage to collateral tissues. Femtosecond pulsed lasers are currently used for LASIK (cornea refractive surgery); in this procedure, the laser is used to ablate a portion of tissue known as a lenticule from the cornea. 20 In addition, it is being considered for treatment of presbyopia (age-related vision changes) and for use in keratoplasty (cornea plastic surgery). Femtosecond laser surgeries involve two different modes. 21 Processing at low irradiance involves direct multiphoton interactions and free electron-induced chemical processes; at high irradiance, thermoelastic stresses may play signifi cant roles. Bashford described another use of lasers in medical therapy. In this approach, which is known as laser therapy, low intensity laser energy can be used to alter cellular function. This type of laser-tissue interaction may be used to treat neurological tissue, musculoskeletal tissue, and other soft tissues. 22 Laser processing of biomaterialsEfforts to examine laser-material interaction for biomedical device applications have largely paralleled efforts to examine laser-tissue interaction for clinical medical applications. Some of the earliest applications of lasers for processing synthetic biomaterials involved assessment of laser welding as an alternative to conventional investment soldering. As noted by Eliades e...

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“…al. [39] estimated the feature size for various combinations of processing parameters and rearranged the solution for a one-dimensional condition. They also estimated the energy required to produce a single fringe of a particular surface feature size using the following expression:…”

Section: Feature Widthmentioning

confidence: 99%

“…If this ratio is greater than one, i.e., a surface feature size larger than interference fringe size, it is likely to produce an array of surface features with partial overlap. [39] Thus, for a given laser wavelength, the nature of surface features is influenced by the angle between interfering beams and the thermal conductivity of the material. The optimization of this ratio depends on the physical, chemical and microstructural characteristics to be generated within the feature that in turn will be dictated by the application.…”

Section: Feature Depthmentioning

confidence: 99%

Phase‐Modulated Hierarchical Surface Structures by Interfering Laser Beams

Daniel

Dahotre

2006

Adv Eng Mater

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A high‐energy laser interference direct modulation technique is proposed to develop surfaces for energy‐efficient performance based on microstructure and physical parameter control. By producing the surface features or particles at the nano to micron scale in an orderly and/or parallel manner with a lateral long‐range order, the surfaces can be configured for highly improved surface response for a host of properties, including wear and friction. Laser interference direct modulation can lead to an optimized composite of metallurgical (localized alloyed or composite regions) and topographic textures. The technique is rapid prototyping, low cost and one‐step method that can be well‐integrated into existing production lines without the need for any special atmosphere. It is usable for complex geometries of the components and the surface can be modulated for nano‐micro scale features on large areas. The present paper describes the principle behind the laser interference technique configured for surface modulation and provides the definitions of surface structures (features) evolved. Some examples of laser‐based surface modulation of materials systems are presented.

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The application of laser-induced multi-scale surface texturing

Cited by 18 publications

References 22 publications

Wetting behaviour of laser synthetic surface microtextures on Ti–6Al–4V for bioapplication

Wetting behaviour of laser synthetic surface microtextures on Ti–6Al–4V for bioapplication

Laser micro- and nanofabrication of biomaterials

Phase‐Modulated Hierarchical Surface Structures by Interfering Laser Beams

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